ABSTRACT

Digested, undigested and green organic amendments were used to improve soil fertility and minimize any harmful effects. To understand the events in soil, we evaluated the nitrogen (N) and sulfur (S) mineralization in soil after adding with cattle manure and green manure. Eleven organic amendments were fresh dairy cattle manure, digested cattle manure with different temperature, green manure digested and undigested. The organic matter mixed soil was 200 mg total N kg⁻¹ soil on dry weight basis, and this rate was equivalent to about 180 kg N/ha. Water was added to each soil sample and was incubated at temperatures 20 ± 2 °C under anaerobic condition. Soil sampling was done at 7-day intervals up to 84 days of the experiment for analysis of available N and S contents. The availability of N and S in all amended soils increased with incubation time showing a maximum mineralization occurring within 84 days for N and 49 days for S then decreased. Soils amended with digested green manure released 169.8 mg N kg⁻¹ during the 84-day incubation. At the end of the incubation, net N mineralization was observed from alfalfa digested treatment as 71.3% of the applied total N. At the end of the incubation (84 days), net S mineralization ranged from 1.75% in Alfalfa digested (T₁₁) to 26.0% in wheat straw (T₃) treatment. Significantly lower amounts of S mineralization was observed for the soil treated with different digested cattle slurry and straw condition as compared to undigested cattle manure.

摘要

消化、未消化和绿色有机改良剂用于提高土壤肥力并尽量减少任何有害影响。为了了解土壤中的事件，我们评估了添加牛粪和绿肥后土壤中的氮 (N) 和硫 (S) 矿化。11种有机添加物为新鲜奶牛粪、不同温度消化牛粪、已消化和未消化绿肥。有机质混合土为200 mg总N kg ^-1土壤干重，这个比率相当于约 180 kg N/ha。将水添加到每个土壤样品中，并在厌氧条件下在 20±2°C 的温度下孵育。土壤采样以 7 天为间隔进行，最长可达 84 天的实验，用于分析可用的 N 和 S 含量。所有改良土壤中 N 和 S 的可用性随着孵化时间的增加而增加，表明 N 的最大矿化发生在 84 天之内，S 的 49 天然后下降。在 84 天的孵化过程中，用消化过的绿肥改良的土壤释放了 169.8 毫克 N kg ^-1。在培养结束时，从苜蓿消化处理中观察到净 N 矿化为施用的总 N 的 71.3%。在培养结束时（84 天），在消化的苜蓿（T₁₁ ) 至 26.0% 在小麦秸秆 (T ₃ ) 处理中。与未消化的牛粪相比，用不同消化的牛粪和秸秆条件处理的土壤中观察到的 S 矿化量显着降低。